Large proportion of CD56+ MM cells were detected in 8 of 10 patients, and GAL9 and ICOSL expressions were widely found in MM cells from all patients (Figure 1e), whereas high PD‐L1 or PD‐L2 expressions were only observed in few MM cells (Supplementary figure 1a). Here, PDCD1LG2 is linked to Miyoshi myopathy.